Effect of Cr contents on the diffusion behavior of Te in Ni-based alloy
Effect of Cr contents on the diffusion behavior of Te in Ni-based alloy
复制标题
Cr含量对Ni基合金中Te扩散行为的影响
DOI：
10.1016/j.jnucmat.2017.10.062
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发表时间：
2017-10
影响因子：
3.1
通讯作者：
Zhijun Li
中科院分区：
文献类型：
--
作者：
Yanyan Jia;Zhefu Li;Xiangxi Ye;Renduo Liu;Bin Leng;ie Qiu;Zhijun Li
裂变产物Te引起的镍基结构合金脆化是熔盐堆面临的主要挑战之一。据报道，固溶元素Cr可以防止由Te引起的晶间裂纹的情况。然而，对这一现象还没有详细的机理解释。通过800 °C下100 h的扩散实验，研究了Cr对Te在Ni-Cr二元系中扩散的影响。结果表明，Te与Ni-15%Cr合金反应主要生成Ni 3 Te 2，而Cr 3 Te 4只在Ni-15%Cr合金表面生成。根据热力学化学反应过程的讨论，在Te/Ni-Cr体系中，Cr 3 Te 4的生成吉布斯自由能最低，是稳定性最好的优先生成化合物。随着合金中Cr含量的增加，Te沿着晶界的扩散深度显著减小。此外，还描述了反应产物的形成过程和扩散过程。Ni-Cr合金中高含量的Cr可通过形成Cr 3 Te 4相抑制Te的扩散，从而保护晶界免受Te的侵蚀。
The embrittlement of Ni-based structural alloys caused by fission production Te is one of the major challenges for molten salt reactors. It has been reported that solution element Cr can prevent the situation of intergranular cracks caused by Te. However, there is no detailed mechanism explanation on this phenomenon. In this study, the effect of Cr on Te diffusion in Ni-Cr binary system was investigated by diffusion experiments at 800 °C for 100 h. Results show that Te reacts with the alloy mainly forming Ni3Te2, and strip shaped Cr3Te4is only found on the surface of Ni-15%Cr alloy. According to the discussion of thermodynamic chemical reaction process, Cr3Te4exhibits the best stability and preferential formation compound in Te/Ni–Cr system as its Gibbs free energy of formation is the lowest. With the increase of Cr content in the alloy, the diffusion depth of Te along grain boundaries significantly decreases. Moreover, the formation process of reaction product and diffusion process are described. The diffusion of Te can be suppressed by high content of Cr in Ni-Cr alloy due to the formation of Cr3Te4and thus the grain boundary is protected from Te corroding.
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影响因子：
2.7
作者：
S. Ohta;T. Kaneko;H. Yoshida
通讯作者：
S. Ohta;T. Kaneko;H. Yoshida
影响因子：
6
作者：
S. Baik;M. Olszta;S. Bruemmer;D. Seidman
通讯作者：
S. Baik;M. Olszta;S. Bruemmer;D. Seidman
影响因子：
1.7
作者：
LeBlanc, David
通讯作者：
LeBlanc, David
影响因子：
1.1
作者：
Keng Yuen Foo;B. Hameed
通讯作者：
Keng Yuen Foo;B. Hameed
影响因子：
3.1
作者：
BAES, CF
通讯作者：
BAES, CF